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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '002aa8ff247a57b160aca2480d3bece8c98a25353f9a288369fd8bc3cb96d4b0' 
  AND token = 'sueyXBXpa4gyCvBfc4efgpfx+FHY7OHx+Kdc4AMKf3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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