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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b75f02495955d9f6099f8887f1815d85451a55a9be566554967a0352cd95362' 
  AND token = '+G1u2mrqPJyca3WKEdz6NToR08+bxlSSRifXUxKKq4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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