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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd4203b02b8d83b459a2a7a3e0abf25ccdec59fbb8f1d2c238c64a58d2132a2b' 
  AND token = '3iHVcXvMz5H6EoI3A+Sr7klVQWFycCVPW7bOqEv64es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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