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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba9e45b3892534caff06db6875c69ba6f28f5c9c878ab0a2aa0feac944ce0ba' 
  AND token = '+UHqIBftfU/5MTx4ODxgOge3dqi/SHmzIym4mr2TtTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}