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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7a572201efdf277e3c9f4d7ceb2726e0e0e4b10145898d4c8f7a38572d4d7f3' 
  AND token = 'LDyOr9mH0JgxyNEfQG7huQRPPyClZpG6MRmTsqaRySc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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