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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0de24493d695aeb7f13ff4c2c09e533a8ecfc2f6d597616a7d62d8a3b2054c5e' 
  AND token = '+9a/CuYx3/a1yUBWXDptmvskqXbmLPPtN3Wx+3sqdxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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