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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd2fc3e3b2689e1053749adc71da786b87b3867cb6dc4b047ce49658fd23e64' 
  AND token = '5U9Y+jK6jVnAdwIo91jEV+NnAU1p3wnbNdwkC6rGkzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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