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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '006a6043fedf1a10f3e614c7202628452a62c2e5589f56ea5d843747ff38e90e' 
  AND token = 'bAaRfNvM2oq3j7uQH00xBVqR3W3Gu1n5Srq2ktuzrEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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