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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd90bcbd77e2d5df12e6cdd83158976efbc24de52c039725fc63808a78ab2d3f2' 
  AND token = 'NZSz15sP2Jb5ewy9fTgwealg06rJKS3mqblQsNP8JKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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