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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18b36d7a5bd345c84486e50fd42613312e715f5dc62b688ffe69ae086b5a4ad8' 
  AND token = '3F1945YGQ5hokc10fx0T3ieDukJ21xESgeQfw8viWhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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