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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea84d0f311e38ff92926ef7c72c0ebbdfb25193811d8b246bb0e14b1d826ce8b' 
  AND token = 'oYRFeJW3Hph6t+9hzzoTBka/FPUod/CDnpc6s3fono4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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