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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0fb3b3cf98e8a92a1f1b887d22f59f65c4f69c5c9521328928fc6c2a85ff099' 
  AND token = 'YwV8nGCrUfN7gRctO/toRbQUb+Ut6j/KhbYdLMBsow8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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