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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '706f9e29e8d45f5b9624490ad6f5c91bc5308d6b828f294c6edc21a446ebfc0a' 
  AND token = 'm5fZ/GHsRAnrDxSRujGp8GXuTtZJ9AnIBWtU7o4ex7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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