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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5eaad11750df3ab1d025da1d0c821421291c45fdaccb7d7216f30b30d2b6626' 
  AND token = '7g1+a47rHJm5XXC7KhUqMdJKHabxrQPfVYWr9Lmz104=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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