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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90afb706d94640d1a1889980af56dd1daace486ed055548a122736a9240d81d4' 
  AND token = '4Kwg9FS7hGFFDr1E9rXP9lI+UV6+vgVPR56gQ3MzCws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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