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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03fcc2d54c462cd91f5e42f3a9e4b935182f06c7c6963525c7ba17b73e35e307' 
  AND token = 'IVh0EPzVLiSeVXjEAbfb+3YCx0LeiLLb+t+5cssQYCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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