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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd6ce2cfe2af3dd3ea7ae0551ddc10890f32a16279dd20c8d35989b9bf9812e5' 
  AND token = 'dGT3q6FrrNzUuygz4gr7wJJeuS/cw+Fxn8Q4txlbOrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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