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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '648fa4c0e9b1d5aa79f4cbecee1f7130d54fbea441f8903fa24f6add2b2a85f2' 
  AND token = 'hNLpKegDm8ps0oij/5Tiu5djmOYqmnpAchmdMtl5D3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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