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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f25522ac96a5bf854f97698c274773af718c09e02fccd248733cb8044795f1e5' 
  AND token = 'M6nVMahONKheqCE1nkD3wZ7XdrihYwK/+l7cmMfqR1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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