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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6e20ffeb264a3e1fdc983ab3ecd7f215c8216801583b29041c0d5bf5cb015b3' 
  AND token = 'T4+tNTy2c85vp2Gyd6ast8fq1/H4vCLetjTZ/Nfsj2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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