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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3eb105a11e84b6023113f14ac6aefb3f5429d87da594c5f6ddeda8bd8d83dd7' 
  AND token = 'C/TEs0CnbvM4hjudrC0Nt4nExxbOL2kC1N2ell3d7L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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