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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb119beb2d595dc343f3e345863c8d4b1c29be68632f45912da82e0710e324c' 
  AND token = 'Wz/cyTJ1PC0sZaCF7mrV5A/UnXIE739Q9zAuH3PhEAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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