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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0666658c77b55b4b077fb047f3316c8b836459fc0082967d0c9b65f034de6d' 
  AND token = '1xyLNeItyaT3g2wMlbQwPx0E4Gtlc4e6E4xo2lpAh8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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