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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a6b0a5afafbb3d078df14b2dac2ec856969aaf93f492b9e49ffd8048862a2dd' 
  AND token = 'zV7xF+p//9LycijT1awsaNs/LwFqcWVz1Bx7eCkPUVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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