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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '311aea165229aabfdf1da5f824b83b9ecfbcbd2d8074901fa426a7d6c57c0d00' 
  AND token = 'FPHRRWEu/x6hhvlJ6PPknF42MRgVzcvC43JU0P/Yo6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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