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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7bba04bdefdf6c43be482a407b76896970c0c948b394c8c73bd47e79f5d48df' 
  AND token = 'rRp8PpTQeShuXePMy+wiZ+CzKT9VF6bWc/NC4iI3IzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00125

JSON explain

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