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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be95f5aa69bfaba73b339b3d975224cc527b7095fe8bb514c5a55d09d5c3259' 
  AND token = 'AY1zALVNwqr69Ek4Il57u8h5H/Sr3Fd2GDDc9/Vjapg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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