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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e42f51ff7da697f113cc63a2dfdae9d318ced9d61dfee2a1b751c31914f8be9' 
  AND token = 'iAho0oDOXRImOMELG7i0ipZ/eBb3Ase0RF7HGtYRQy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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