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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1e1f25a687376a1d3e62e49141b1bfc2d67c75e9f92ed1f0623d849de67761' 
  AND token = 'l/qOPLJU1dt138Qz/vHT4grooG5vRJbwoZeUYkEeolA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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