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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e67637447d8520927ce44a595ac418d9afd7dd34d74d3a21bd16d7a95dbb7681' 
  AND token = '6GP7cmPkr/myPJZuFrh0yc89oXcY10MmVO40Dmhm79o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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