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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e02927e595376c82256681bd38d3727e113d8dc0307161943863f0d0c6ee9ef' 
  AND token = 'Sk878RleoEd+33uzruwlLXzprD+z67iYI2sy455lITs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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