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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90009e244de9bac3abf9cf881fa97bc27fd0f25b3b1a77503e487751bffb5a53' 
  AND token = '/f7hsA12bYPuL10c+jnK+wn4Sew6rbh9N3LYqZyNH7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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