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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd6ae10a75aa2c739ba41eefe32de42661a8232e41e23f13229ee9064fce77c' 
  AND token = 'RnknBLDmJD9ZO07BGt+MzGy1E2QS9LLuY63SYcthavs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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