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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c789a80b096264f0ca3ac8a78677652ac6b0cc070f338b6388c590dc62c619' 
  AND token = '7dO05Pe6zn+1ls8Ugo+6KUNctNP+g61JZ6oPq3D3r0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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