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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e1e2eaaa1af91260b611f8a064472e6c3bf06a160666a59ff04620ecca7a31' 
  AND token = '+m35+HxEpmKbEhRE17TbJh4wA2Oj50hhRBFhTDzJaFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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