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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ca4306ff5a908b416a1b96ac6d9d728a9b8ce8073ac020b0b3a64179297d106' 
  AND token = 'AVDPiTxgeYVtgFwF7onwpy9nL4hP0Aiy+NU94u89y8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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