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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f27907f3d56ff98eb221b7232dc12daacd83ee066ec13dce9431a3bdcfecbbaf' 
  AND token = '87TdCuHX+F++EKpd6gkIihknYZDNkJij6x70rXzLul8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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