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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bae39a533aad059f1af7b0d5a4110c781fa8673b443ba83e4318613295b9b4c' 
  AND token = 'UfAe7+zsyjDaPi6G4Pgymt7mlX0LP6Ix4FUJm4b9hM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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