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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba9c49c019bf733f1a98840870e976b0e6a7c716aa609e86e3808382d51d997a' 
  AND token = 'YVAZvUVT2r1X4rFTuVKNNlXtjRGTiMxXEmbHg+rEwpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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