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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '932bc911d554149b7e5628ced2ad67f5194434ba40af7f4938489c4df52dfbb1' 
  AND token = '68FwNNRkoLpFjbsV28Cr45BYcSIzecbwc2bbDHQ8ybE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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