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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe5251f2a09adb543c6013fc544954de3329e3909fec15cda3d4d9e72a9d991' 
  AND token = 'YVKv2TN5zUkKTyy+8KQJn0Ba5SxvE/L3SLR29zeg8AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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