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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0d8c06d1969ffc0b30da7a33acec061d141020cf7ba19e6cc0b13d19560fb02' 
  AND token = '06KQWAM7djlrAXc0pBXmJvpX/tozA6P+qDW5U8p0r70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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