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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '873848a86a159fb90d722dc32ab16debd57efbf9259fd0703fa41268d10048c6' 
  AND token = '+RVLUz2hf7HF4vcdcKHkynjp2LB+2iD8R1LEooqzERM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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